fix(FilterableMultiSelect): no aria-describedby helperText when invalid

[tay1orjones]

Closes #19644

Small update to not place aria-describedby w/ the helperText id when the input is invalid and helperText is not shown/rendered.

Changelog

Changed

• update filterablemultiselect aria-describedby logic w/ a new test

Testing / Reviewing

• Go to the ?path=/story/components-multiselect--filterable-with-select-all&args=helperText:something;invalid:!true story
• Make sure that the helperText prop is set to something and invalid is true
• Open the story in the popout iframe and run ac checker
• You should see no violations

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
  - [ ] Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.12%. Comparing base (30b4f87) to head (f59eab2).
⚠️ Report is 317 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20738      +/-   ##
==========================================
+ Coverage   91.39%   92.12%   +0.73%     
==========================================
  Files         485      509      +24     
  Lines       31370    35687    +4317     
  Branches     5430     5655     +225     
==========================================
+ Hits        28670    32876    +4206     
- Misses       2547     2663     +116     
+ Partials      153      148       -5     

Flag	Coverage Δ
main-packages	85.41% <100.00%> (+0.48%)	⬆️
web-components	96.68% <ø> (-0.48%)	⬇️

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[heloiselui]

Tested and confirmed, the PR resolves this issue.

I noticed we have the same problem when warn is true: "The 'id' 'filterablemultiselect-helper-text-id-«r4»' specified for the ARIA property 'aria-describedby' value is not valid." - not sure if you want open a new issue for that.

I also noticed that in the Default example, in controls, both invalidText and warnText use "Whoopsie!" as sample content. I think it would be nice to include that in all the other story examples as well, and add something similar for helperText, but just thinking out loud.

[tay1orjones]

@heloiselui great catch, thanks! I updated to fix the warn bit

[carbon-automation]

Hey there! v11.94.0 was just released that references this issue/PR.